Buggy code:
public class GroupArgument { private Javadoc . Html title ; private Vector packages = new Vector ( 3 ) ; public GroupArgument ( ) { } public void setTitle ( String src ) { } public void addTitle ( Javadoc . Html text ) { } public String getTitle ( ) { } public void setPackages ( String src ) { } public void addPackage ( Javadoc . PackageName pn ) { } public String getPackages ( ) { } } public void setCharset ( String src ) { } public void setFailonerror ( boolean b ) { } public void execute ( ) throws BuildException { if ( "javadoc2" . equals ( taskType ) ) { log ( "!!<seq2seq4repair_space>javadoc2<seq2seq4repair_space>is<seq2seq4repair_space>deprecated.<seq2seq4repair_space>Use<seq2seq4repair_space>javadoc<seq2seq4repair_space>instead.<seq2seq4repair_space>!!" ) ; } if ( ( sourcePath ) == null ) { String msg = "sourcePath<seq2seq4repair_space>attribute<seq2seq4repair_space>must<seq2seq4repair_space>be<seq2seq4repair_space>set!" ; throw new BuildException ( msg ) ; } log ( "Generating<seq2seq4repair_space>Javadoc" , MSG_INFO ) ; if ( ( doctitle ) != null ) { cmd . createArgument ( ) . setValue ( "-doctitle" ) ; cmd . createArgument ( ) . setValue ( expand ( doctitle . getText ( ) ) ) ; } if ( ( header ) != null ) { cmd . createArgument ( ) . setValue ( "-header" ) ; cmd . createArgument ( ) . setValue ( expand ( header . getText ( ) ) ) ; } if ( ( footer ) != null ) { cmd . createArgument ( ) . setValue ( "-footer" ) ; cmd . createArgument ( ) . setValue ( expand ( footer . getText ( ) ) ) ; } if ( ( bottom ) != null ) { cmd . createArgument ( ) . setValue ( "-bottom" ) ; cmd . createArgument ( ) . setValue ( expand ( bottom . getText ( ) ) ) ; } Commandline toExecute = ( ( Commandline ) ( cmd . clone ( ) ) ) ; toExecute . setExecutable ( getJavadocExecutableName ( ) ) ; if ( ( classpath ) == null ) { classpath = Path . systemClasspath ; } else { classpath = classpath . concatSystemClasspath ( "ignore" ) ; } if ( ! ( Javadoc . javadoc1 ) ) { toExecute . createArgument ( ) . setValue ( "-classpath" ) ; toExecute . createArgument ( ) . setPath ( classpath ) ; toExecute . createArgument ( ) . setValue ( "-sourcepath" ) ; toExecute . createArgument ( ) . setPath ( sourcePath ) ; } else { toExecute . createArgument ( ) . setValue ( "-classpath" ) ; toExecute . createArgument ( ) . setValue ( ( ( ( sourcePath . toString ( ) ) + ( System . getProperty ( "path.separator" ) ) ) + ( classpath . toString ( ) ) ) ) ; } if ( ( version ) && ( ( doclet ) == null ) ) { toExecute . createArgument ( ) . setValue ( "-version" ) ; } if ( ( author ) && ( ( doclet ) == null ) ) { toExecute . createArgument ( ) . setValue ( "-author" ) ; } if ( ( Javadoc . javadoc1 ) || ( ( doclet ) == null ) ) { if ( ( destDir ) == null ) { String msg = "destDir<seq2seq4repair_space>attribute<seq2seq4repair_space>must<seq2seq4repair_space>be<seq2seq4repair_space>set!" ; throw new BuildException ( msg ) ; } } if ( ! ( Javadoc . javadoc1 ) ) { if ( ( doclet ) != null ) { if ( ( doclet . getName ( ) ) == null ) { throw new BuildException ( "The<seq2seq4repair_space>doclet<seq2seq4repair_space>name<seq2seq4repair_space>must<seq2seq4repair_space>be<seq2seq4repair_space>specified." , location ) ; } else { toExecute . createArgument ( ) . setValue ( "-doclet" ) ; toExecute . createArgument ( ) . setValue ( doclet . getName ( ) ) ; if ( ( doclet . getPath ( ) ) != null ) { toExecute . createArgument ( ) . setValue ( "-docletpath" ) ; <START_BUG> toExecute . createArgument ( ) . setPath ( doclet . getPath ( ) ) ; <END_BUG> } for ( Enumeration e = doclet . getParams ( ) ; e . hasMoreElements ( ) ; ) { Javadoc . DocletParam param = ( ( Javadoc . DocletParam ) ( e . nextElement ( ) ) ) ; if ( ( param . getName ( ) ) == null ) { throw new BuildException ( "Doclet<seq2seq4repair_space>parameters<seq2seq4repair_space>must<seq2seq4repair_space>have<seq2seq4repair_space>a<seq2seq4repair_space>name" ) ; } toExecute . createArgument ( ) . setValue ( param . getName ( ) ) ; if ( ( param . getValue ( ) ) != null ) { toExecute . createArgument ( ) . setValue ( param . getValue ( ) ) ; } } } } if ( ( bootclasspath ) != null ) { toExecute . createArgument ( ) . setValue ( "-bootclasspath" ) ; toExecute . createArgument ( ) . setPath ( bootclasspath ) ; } if ( ( links . size ( ) ) != 0 ) { for ( Enumeration e = links . elements ( ) ; e . hasMoreElements ( ) ; ) { Javadoc . LinkArgument la = ( ( Javadoc . LinkArgument ) ( e . nextElement ( ) ) ) ; if ( ( la . getHref ( ) ) == null ) { throw new BuildException ( "Links<seq2seq4repair_space>must<seq2seq4repair_space>provide<seq2seq4repair_space>the<seq2seq4repair_space>URL<seq2seq4repair_space>to<seq2seq4repair_space>the<seq2seq4repair_space>external<seq2seq4repair_space>class<seq2seq4repair_space>documentation." ) ; } if ( la . isLinkOffline ( ) ) { File packageListLocation = la . getPackagelistLoc ( ) ; if ( packageListLocation == null ) { throw new BuildException ( ( ( "The<seq2seq4repair_space>package<seq2seq4repair_space>list<seq2seq4repair_space>location<seq2seq4repair_space>for<seq2seq4repair_space>link<seq2seq4repair_space>" + ( la . getHref ( ) ) ) + "<seq2seq4repair_space>must<seq2seq4repair_space>be<seq2seq4repair_space>provided<seq2seq4repair_space>because<seq2seq4repair_space>the<seq2seq4repair_space>link<seq2seq4repair_space>is<seq2seq4repair_space>offline" ) ) ; } File packageList = new File ( packageListLocation , "package-list" ) ; if ( packageList . exists ( ) ) { toExecute . createArgument ( ) . setValue ( "-linkoffline" ) ; toExecute . createArgument ( ) . setValue ( la . getHref ( ) ) ; toExecute . createArgument ( ) . setValue ( packageListLocation . getAbsolutePath ( ) ) ; }

Fix:
toExecute . createArgument ( ) . setPath ( doclet . getPath ( ) . concatSystemClasspath ( "ignore" ) ) ;